Usages

Facts

Until Taipei 101 was topped out in 2004, the Sears Tower held title to the world's highest roof and highest occupied floor.

This has been the tallest building in Chicago since 1974. For a timeline of Chicago's tallest building through history, start with Holy Name Cathedral.

The structure is formed from nine bundled square tubes, each 75 feet wide with no columns between the core and perimeter. Two of the tubes are 50 floors high, two are 66 floors, three are 90, and two are 108.

Sears executives chose to build a single tall headquarters building over an alternative proposal for twin towers at half the existing tower's height.